Xerox DocuPrint 180 Configuration Manual page 268

MICR PRINTING
Security issues
Clearing memory
14-2
NPS MICR printers do not offer the same security or audit features
found on printers like the 4635 MX LPS.
To enhance security, you will need to delete MICR fonts after use,
and install them before the next use.
See the Generic MICR Fundamentals Guide for more information.
After all MICR jobs have been printed and the MICR fonts have been
deleted off of the DocuPrint NPS disk, if there is concern related to
access of residual contents of MICR fonts in memory on the
DocuPrint NPS system, the sequencer should be restarted.
although it is extremely difficult to retrieve contents in memory, using
the Restart Sequencer command will clear all fonts in memory and
force the PostScript and PCL interpreters to reload fonts into memory
for the next job.
Clearing jobs To confirm that there are no MICR jobs left on the DocuPrint NPS
system, use the List Documents command to list "Held" and
"Ineligible" documents to check for MICR documents waiting to be
printed. If these documents have already been successfully printed
and are duplicate jobs, they should be deleted by using the Cancel
Documents command. If the document still needs to be printed, use
the appropriate procedures to determine the cause of the problem
and take the actions to correct the problem. Though the MICR jobs
will still be listed when the List Documents command is used to list all
or completed jobs, as long as the document status is "Complete",
only the attributes of the jobs have been kept, the job itself has been
deleted from the spool area.
XEROX DOCUPRINT NPS GUIDE TO CONFIGURING AND MANAGING THE SYSTEM